QTextureImage handling broken making it impossible to use mipmaps, layers, cubemaps

void GLTexture::uploadGLTextureData()
{
    // Upload all QTexImageData set by the QTextureGenerator
    if (m_textureData) {
        const QVector<QTextureImageDataPtr> imgData = m_textureData->imageData();

        for (const QTextureImageDataPtr &data : imgData) {
            const int mipLevels = m_properties.generateMipMaps ? 1 : data->mipLevels();

            for (int layer = 0; layer < data->layers(); layer++) {
                for (int face = 0; face < data->faces(); face++) {
                    for (int level = 0; level < mipLevels; level++) {
                        // ensure we don't accidentally cause a detach / copy of the raw bytes
                        const QByteArray bytes(data->data(layer, face, level));
                        uploadGLData(m_gl, level, layer,
                                     static_cast<QOpenGLTexture::CubeMapFace>(QOpenGLTexture::CubeMapPositiveX + face),
                                     bytes, data);
                    }
                }
            }
        }
    }

    // Upload all QTexImageData references by the TextureImages
    for (int i = 0; i < m_images.size(); i++) {
        const QTextureImageDataPtr &imgData = m_imageData.at(i);

        // ensure we don't accidentally cause a detach / copy of the raw bytes
        const QByteArray bytes(imgData->data());
        uploadGLData(m_gl, m_images[i].mipLevel, m_images[i].layer,
                     static_cast<QOpenGLTexture::CubeMapFace>(m_images[i].face),
                     bytes, imgData);
    }
}

return QByteArray::fromRawData(m_data.constData() + offset, mipmapLevelSize(mipmapLevel));